Apocynaceae (Dogbane Family) Synonym(s): Eastern Bluestar, Blue Dogbane, Willow Amsonia, Woodland Bluestar Base Flower Color: BlueReproductive Phenology: May, JunBloom Notes: Anthers yellow-orange. Flowers often partially hidden by uppermost leaves. For more information about this plant, Click Here. Similar Species: Gattinger’s Bluestar (Amsonia tabernaemontana Walter var. tabernaemontana)